Sceneform SDK for Android was open sourced and archived ( github.com/google-ar/sceneform-android-sdk ) with version 1.16.0.
This site ( developers.google.com/sceneform ) serves as the documentation archive for the previous version, Sceneform SDK for Android 1.15.0.
Do not use version 1.17.0 of the Sceneform Maven artifacts .
The 1.17.1 Maven artifacts can be used. Other than the version, however, the 1.17.1 artifacts are identical to the 1.15.0 artifacts.

Scene.OnUpdateListener

Page Summary

Scene.OnUpdateListener is an interface used to receive callbacks once per frame before the scene is updated.
It has one abstract method, onUpdate , which is called with a FrameTime object providing timing information.
ArFragment and BaseArFragment are known indirect subclasses that utilize this listener.

public static interface Scene.OnUpdateListener

Known Indirect Subclasses

ArFragment	Implements AR Required ArFragment.
BaseArFragment	The AR fragment brings in the required view layout and controllers for common AR features.

Interface definition for a callback to be invoked once per frame immediately before the scene is updated.

abstract void

onUpdate ( FrameTime frameTime)

Called once per frame right before the Scene is updated.

Called once per frame right before the Scene is updated.

frameTime

provides time information for the current frame